I recently purchased a used 91 940SE wagon. It's been quite well maintained and extensive checking finds only a few wear and tear items to deal with. However, I'm not too familiar with the warm-up characteristics of these turbo beasties. I notice that the temp guage goes from stone cold to fully warm (12:00) in a matter of about 2-3 minutes of driving. Never overheats, no odd noises or running problems and the heat seems to work properly. It just seems to me that this is extremely fast for a car to warm up.
If this isn't normal - ie the guage or sending unit is faulty - where do I start looking under the hood for electrical connections and testing?

Thanks,
Ben